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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f887ed464067a73db3da73e0fb20101697f6978c9ab95a74d8aa11261cb68bfe' 
  AND token = '8IZcyhSbtX1eWMVZ3hv7n9vPKxeFrnbTmjul10hFJAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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