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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa9db74204a11ff2d1b3de3c06ada75c8bef938e89ea49e055819313895a6ec' 
  AND token = 'me26MMnuM0DdeBMSq/YZCv08wBJduVr53iDACrLVrI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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