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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5faa212991d741a4fd5f11461fec407c61cd772bf74e1ff918e9218f781feacb' 
  AND token = 'MLx5qAf321b0Z5f1yubcB2LPdJtcDyppm3+ulf3dfDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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