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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4676dc8501c98047552c6a32f4e1bf85baa538a92ab6c399ecc7c19efa7ac7fa' 
  AND token = 'WBreCVoanLGJG/2p0WSaodX28HBO+nH4WjKJtSAgV9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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