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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e0e55c8e7594876a89ce29a72554b590e129a173751e363fa7e61d68490a39' 
  AND token = 'i0t0hvSM4FzJnpZdCv3fgZ3MnoMl7PlpmZ64BOO4XWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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