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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179976dfe419ac207d85d7210d494212cf89c4b5bb9c34c3f44580866d281af1' 
  AND token = 'sp4IApoBGIe7C9bI8tveP20+fgf7Epi0rzJS8hYmXbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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