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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df27be3407527d8808ec99c7420298e2e70725b7b4e2b24881e3d066029fbb3f' 
  AND token = 'BxrljdDEcf8snywVXm7UHfCA1F6dlAAB03VmfSTdNOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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