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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28d9380dad40f47cc2bf6710b5dc2008fefa5a379dd9162a00c6bb568349d47' 
  AND token = 'BGreLUFt7ZqtqkdU6zR2BwWENnQIc3Sh1N5WfSkhWBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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