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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b107a0c7199e4a80e4f48d99fc6a50c7cc3e479d22dfabcbbbc8e2b0f93d83d5' 
  AND token = 'SUOxx4ap7QTGXqR0m4SAwoIrugut1V1bwWnIA4cJk1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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