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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c77a0a9378d424a1fc4331c25a6526d2f353cbf79b36e72932ac5ffe9ff183a' 
  AND token = 'pkk81xrbB2oye3Bw3Fmgu68HvaiFD8ew3iEDAJkEkFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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