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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee873f1c0186b29b25c6af53920f7611f65e853bbfb0aa9aced6971f144f780c' 
  AND token = '3yJY7u39Z0jVfJx78qv6BYPz7QP9q8iJXUph/O50Ok0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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