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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68288c62a486401ac91b0487accd323371fa0d32a20ed6eb4244f85cba06be9d' 
  AND token = '6k5KPaudIxD+n488tVP2KAEAXfHdk9BDNSGIHqH2gko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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