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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe93448568f423741f9888d9a24e3e087f0c91a6a1c1ff464b5595e4b3964bb1' 
  AND token = '1LjMq3+4RiCmtaKfb+WJNE28agJ3DRT09BuQVQkVX+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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