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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d2dd05f5add02ce4201650c1a529b9213ed349bf5e40367edbbb1c1ca88c11' 
  AND token = '/8kD09NUP9u6/hQAXuhPN8AwlVWuh5HyPS+DDycx4gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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