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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69f24b508999d6eabf0e384c712f8eda47b99b05d1a25903261efb1d30d60b8' 
  AND token = '/68cn69ylfNz3h8ZX2zqqenmtJ8VmXdi+N9tl2F7tn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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