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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ababb938bc65476dbda7ae960507afeee0a974e51ba4c43d64a2367defc2450b' 
  AND token = 'FasNNwIHvwWgCqIR+sAQj9Nv/5LGJVSofiQmjzNVty4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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