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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6df2f7dea96e1fab4289973c0a576a86a703fedba020eade9b7aee712776a2' 
  AND token = 'guFxheI2OYMJIs0cYf97asEEV0ulLAH9URxFJrB/NFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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