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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976e3f4d7f49c695566a41b79b17e9dd58f84710fa77f5665478e8fc6c2dd70c' 
  AND token = 'qhi/vPuGf1UNsigRGeA2eNtMbYPX7ZOTPlA4yoidsrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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