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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bafb02b26e4e0e6113a3f8a322fdb87a5140f992e8c88fad160b2180075a1e2' 
  AND token = 'qJh3DSgZmyARPOTg9rXWQ4fusI+i3nVzAV4WcnYvfQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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