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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5fa00b2be7ff042e507e2ea88da2ab71f463235a4e1a4cac7d86754eba692db' 
  AND token = 'MMMCqO3u1blvYLmHjOIpckbzrSHjYO3Q3C1j5k1U54g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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