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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1841026e1dc04fd5ff1afc0f708a7679dc0da219ef72a178f0a05b456e9ba4' 
  AND token = 'iRDZ1ldlLtxwvE7hUV7pbDDqzr9K5jo6dfg8NhK/OpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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