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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc71fd9f656d8f373215d1c577d9f137d5668a0b80c1e6a26e962bb4c1c74fa' 
  AND token = 'uErmYaknm34gnRCcVBTSEwh7E31MnMGra2gQ68YQ2ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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