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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '748578ebe4bd6505429323a0e8f3553ed66f6511b6646524e7e888058f4a3782' 
  AND token = '+O2zbpop5gnc76hfmSh46V82wv7rgDk4GJo8tG9UkGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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