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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f433bfa2763f68407c9fa925b5f9b5f5112d899e510182000eefcdca3f5f49e6' 
  AND token = 'm1S5tStLNtq4ApbNMQazUgum9hUKD5qcZEvXeCE/dU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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