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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b92a655fd2b626a93e4ed5cf51cf146d68bc2e2bfce8f61b1ce4c8f37314df9' 
  AND token = 'LmShlrwF2Jl1GeWI1jyF30zInfsHuN7L+wKHHJ7XmGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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