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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6103041bacd2e97b910ceb4762c1b4f971320ba8b537b66ccae74e7da525f1c3' 
  AND token = 'G00LvrKi4ZFH5cICrYtoi0Zr7rFWbE49EbzaH/N07q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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