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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f339efe32652d28fbc0e806cd75f9d3d29c89d9b34450d69529581a5ec3184f9' 
  AND token = 'r4FPiKivpl2cvyahcBuIXBWgRwJIFiNv9algM3D1Eqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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