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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f19bd0e93bc4f4fc5ed10539d4148ba4e2f0f37a6cf6ef416fd8678d3226d97' 
  AND token = 'mDuXjsQNaSbav8pkhFu+GAwid///yVbjoMdR3h6FjWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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