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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1eb437836e72e4b3519c15fdca0d9cfcb1c37d1990e8583d5d274af5a264a1' 
  AND token = 'TiDCdSckGz7KHDU7piJwVfOatXS0qak+T+2n5hdTcrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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