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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37efcce06b2f97f0e78754ded278d7b4670acb36b27edf7f9c63c725862391e8' 
  AND token = 'ASJZC/lP8EiSBugV1lv8OOGpN3tL/DZckGoRQCAyyR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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