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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076cea0c5b526127262193bfd3d09b75b3f37c2ee3f7616f0ecfc9fe6c4518a1' 
  AND token = '43g3bAedci49bQmZnVv4MaVJ4gD1/otN/RHSHsGXwcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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