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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6e09e9a494061233fd3dcc235d2012c7dfa15452da7c1d682afd824e68f3c7' 
  AND token = 'ZLwOII51P4IiojiThsBvIfC369+JBCdxpplWQC9RJuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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