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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb586967a588e68ed55a6eb3ffdcf6a3b395ceabdb25278a0e821e17a7b1963' 
  AND token = 'Pb1xRDYfPsauo1tfYdtnQYAx4DomTRgWEKe/E1e5/kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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