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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ce51bb0ef6438a1886b79d8ad1c1c019b84d9a7baf909d123d650b87e5ca9c' 
  AND token = 'e0yYkVUHnwMSRoBYiHRKhQa+yQk4v+RqsMbkc3EmzDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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