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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f074e76893c4563e1c3fd2800de4e0c1fe1229d4a0693670591e90b3944a0da' 
  AND token = 'B9JZl8I15QwhN1snAdprra8kyhUMWEMxJ8rM4IIJNiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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