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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4349211342d8b16eb55c13d4466d867a07bd3bb8b2b6edde90b212672c1d98a' 
  AND token = 'qsp2mootqbN1SsHauzvhbpIEsS/M+2inIQemOfgLHpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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