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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4912dc89349270de352cfeeea31c404b3bb41920e696d342759311633aa8e83' 
  AND token = 't6xjyGgt28PeCNSh9Ce2zV/wY+8w41p9tn/FxllunLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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