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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd364d6d4260f3e61f40d469bf681cacc1ef7dd2351f258c47fbd593ae491e9cf' 
  AND token = 'jbPr1KtY51NFI5bntX02HdC9wA1lV5dwjPk1o7Uz8eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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