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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd390d730a4e632a112bbf303653ae9a4b36fec6a3d54f8561bf857cdf56dea18' 
  AND token = 'ieRgF1gvZLy336M8yZgFAjz0fXqBWVjBo3+4ycxisPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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