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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555eec5324f0b328432b4b26f405dffce84911eaad9e1e1c66184e979ef96b5c' 
  AND token = 'fUPhbfrasvFgWokY42mkGV0i6/ZfJYhPmZj2NEOw8oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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