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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc68260b2f245ea5e08ccbfa5c077f529343581d1bb28950f3e34309428f124a' 
  AND token = 'LDWEaCCGmeSM6D8yulBNoRR0y4ZvFINonZAIH6bo7wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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