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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89af91b0513a916c261d6a3fe5040e7cd3854306c9d54a25ff04af5d664b894e' 
  AND token = 'HLtgvgSNZqZHEu9ji+IuNTz8SUSF4LGooQFpHba2UzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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