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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ff730a270e80ea5a91123f2214e75c2fb194d56d9c6d92458088fca7437454' 
  AND token = 'yZfSM8I16K5T7TyjfnjB2i9l7AyGS0ApGmITjECGcxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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