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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da556116db5bfef5e06a3e521f47544044846e7b45df70451c8222685803b99' 
  AND token = 'kcEicgH1Cij/nSlXd2t1PQ1G8mcztMwnpS2HX3a73iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}