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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a313bb1f5bfa2e4ab7bcbf19bc7f6c0fd0e2fe66f8e2a0399a600c6c65c96a' 
  AND token = 'lFM8at903Y8q/07hn6SBC2UpNxFHFAa1U1IQDlg3hXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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