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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd77e4e15a7c2fdfaca9ba34387433917de74c9d69ee46547ad4706e8a1db7beb' 
  AND token = 'ne97PEd9oOEx3XCFoas1RHJuUQXUTje1PdbwfUQUhSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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