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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e84a2e0f8ca75651fd7bd183338ee35b71f00525b3c9db1d1ce61b7cf03428' 
  AND token = '4gR7pCZgE5Kq0rLhi4m6xmQJDqPCtEZb7peLedFLCUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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