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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832c6dcb13de4772b4fc1cbb09e11c1be7c0c43432bfd18c3ce32abff5439dd6' 
  AND token = 'v8L+Sj5hqIqdvt5Snc5mHF6iier7NV7ERg8N96EtWM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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