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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969144999c8f5f27aa61c97e6a2159374e0ad680a5e80446c8c147d14cb0e935' 
  AND token = 'lJYoJr3nsBc3gfOJ7IYttFA78iFILCEAoMpUh93eccw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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