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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36f9b68f2f25099e24a8a86356cd4f1900b577e9af6c60d8f1a5518bce19936' 
  AND token = 'lWtpc7Bqo359cz32Z67jq2OpT4Rn11LnszEl7u85Ayo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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