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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75ee3aec7ae08c5f8186e3dd0c5e30c9d90e9a5a7ea53912bfea01aa9edf2e84' 
  AND token = 'HKmk36pJbYqDqEUu6JO1wS/T9VaXIT294pyAxMPuDnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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