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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b875f28fc5b10928ec1903727c73d84ff89d09ec53e3e656fa53b102deaac4c5' 
  AND token = '3AQ215oGCQ5jFplAFmdE6tgl2+pLLw4LFT2AWCD50sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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