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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669de13e954e2c956182d555c2b62eaee7e16ece0667a5aa69565aff95e1f914' 
  AND token = 'nU8MV759d+OLb14LKewC591eVnTF4CGE/Mo1gIfgyuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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