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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0204eabe6d7f21649a3762ef36929da995ef2678e57094cabb639608bfe776e' 
  AND token = 'LqVFKPzKyZPUesBOWCRp/ap3pCzFmyWTB/nkMaf97bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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