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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a37887ab17d81bae6e2ce325e4539abb1a738d9ce660b3e5a62d5eb6c8da48' 
  AND token = 'Fc+qZIPS5DzCRcBsBkcAZVbZjmpu7H4VEaYk1o40g6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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