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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67172bd109481be76809b5823077e31424ac9ab2585c0558e3cae24111a86312' 
  AND token = 's6C8jQBe3rFiSyMIz+G+0qx2qh0Acgnrq7o8boG92xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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