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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6961c11eec6dff118760ec0a2478d76e7be3dfac798b0aa7ec064b389c2a8c95' 
  AND token = '9sNRwcWLVyJFfUbiIOOGeKdFTdM/ym+2XO2ImBtn5LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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