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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a629408eb2b028ab25473195b061b6ee444d138ccd04e8d6cf7c8a298fb9cb6d' 
  AND token = 'j5D4SjedEzvOy0mCgydKHUJExNpubMwH98ZjB9302lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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