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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a1a8d94726b2ab85fd0cd77c958acbaf76f46b6b83ba40277e9f6c8a6e6fa0' 
  AND token = 'P1Qu20H1HOD2tXmxDWY6ZHIaTGR215H0sZLlHN2Enec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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