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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868b43ad28c2e11dd9dd5a203e37243d789c19d2c329375951b9d5a5fceb73b8' 
  AND token = 'v9CuS5GuJc4stKMz8EQ0v4fgZs6SSMzF2gl/GX6IMfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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