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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cae3364fedb2062081ad49cbc9f5946b558b8df6e2a30bcdcc3819db1e34f55' 
  AND token = '00nQdsWYL74a3URwB4Wa1Vv7knZEZG7UfWq3YQCGy5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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