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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d52ac627c24ef6900de17b05776c2f3efd5723932edaca7a27d57c008841e06' 
  AND token = 'XBnP/6aznhW7T3HHo6L/gBzdxSfBvuXDONbANTdhxig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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