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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93e06e8ce4c4374541353f8c05f9ebc6f42173781e9cf2e325a6bcd28e1e512' 
  AND token = 't0bO74DPygVa7cc9Zd/5Par7VAUEZoOkXkZG6t39ALk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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