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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e297f85877f49d2210d779f9ecbd2f9875bc2b8d8e5530a608e089fb17a95e8f' 
  AND token = '31fq6wiIkOk9q53QXoMSQABfPaT+XE8nMcQE6IQUvYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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