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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c52ba5fa9388998a608caec9f4fdd1a1127291f15526e6d46620340019fe94d1' 
  AND token = 'Y+lHgbG9CjK46MD5fcEPfcx8nrpAzuY/MmPJ7/5Un+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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