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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6542a297633a6c4c74ab2614e2c41260ca1d2463811162d08c4a6fc06d124159' 
  AND token = 'GqCsg9n3iSdkqgZtZsEDHCf/mtlEMYvKi49Jx/5Fsu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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