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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661c5f1a054d3f75d0309120d5cc211d91e99c55f577612a9a9a6e7be83f56a1' 
  AND token = '/hG3RWJixb3GVkfViL01MJBuvZPifDQPcykBHENgHFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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