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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270c999d9d384e7ba2e9280ba95a29b51ee6d7938fb939eaa715472008309b17' 
  AND token = 'IAYzfsqYS2b9ZCEfcRMzHXYOQjXA8vqRKQQ8VPGY6L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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