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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04e4daaa98e3f70fc3520ce3fe2df4db8c7ffe21a870490f9838dd62c4c1e2d' 
  AND token = 'IuGAQTaGeUjOFQfVfJfWzDJmEJol6yfunMoZzvlQ/s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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