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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec36d711dbd56378a1174b23435ee48a5a360d97965d01ff4ea2d7dc75e1155' 
  AND token = '2mh9uslC2QA97xleoX7S2rncLwvX+lX4euQKwNj0Sjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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