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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624bb9465a1c52c71e2c38d15a0023f1d5fe8bc4fc73f9d7b9bfffa785efd067' 
  AND token = 'Ak9cHi+ARTMiatRSOgfzh/p7Wwcu/0fasJT1swbHT1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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